Vintage Ladies 2 Piece Cocktail Dress

Vintage Black 2 piece International Ladies Garment Workers Union (1955-1963) cocktail dress. Not sure on the size but the mannequin is a size 4/6. Preowned, good condition. The closure on the back is broken and there is a small flaw in the material on the side of the cocktail dress (as pictured) Measurements (while garment is laying flat): Dress: Bust is 15.5”, Length is 43” Jacket: Length is 13”, Bust is 18.5”, Sleeves are 16” Nonsmoking home.